The homogeneity of the chloride level in a water sample from a lake was tested by analyzing por- tions drawn from the top and from near the bottom of the lake, with the following results in ppm CI: Top 26.30 Bottom 26.22 26.43 26.32 26.28 26.20 26.19 26.11 26.49 26.42 (a) Apply the i test at the 95% confidence level to determine if the means are different. (b) Now use the paired / test and determine whether there is a significant difference between the top and bottom values at the 95% confidence level. (c) Why is a different conclusion drawn from using the paired i test than from just pooling the data and using the normal i test for differences in means?
The homogeneity of the chloride level in a water sample from a lake was tested by analyzing por- tions drawn from the top and from near the bottom of the lake, with the following results in ppm CI: Top 26.30 Bottom 26.22 26.43 26.32 26.28 26.20 26.19 26.11 26.49 26.42 (a) Apply the i test at the 95% confidence level to determine if the means are different. (b) Now use the paired / test and determine whether there is a significant difference between the top and bottom values at the 95% confidence level. (c) Why is a different conclusion drawn from using the paired i test than from just pooling the data and using the normal i test for differences in means?
Chapter7: Statistical Data Treatment And Evaluation
Section: Chapter Questions
Problem 7.21QAP
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